<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>内联元素的特征</title>
    <style>
        span {
            width: 400px;
            height: 400px;
            background-color: red;
        }
    </style>
</head>
<body>
    <span>span1</span>
    <span>span2</span>
    <span>span3</span>
    <!--
        内联元素的特征：
        1. 宽高由内容撑开
        2. 不支持指定宽高
        3. 一行上可以显示继续跟同类的标签
        4. 不支持上下的margin
        5. 代码换行被解析
    -->
</body>
</html>